Stereoscopic projection



G. LANE ET AL STEREOSCOPIC PROJECTION Filed July 24, 1922 Nov. 4 1924.

Inventors: George Lane, QQ

AEJ

John Emerson, Summum v )rj-LL Patented Nov. 4, 1924.

AiJNlTlzu STATES 1,514,543 PATENT OFFICE.

GEORGE LANE AND JOHN E. IATTEBSON, OF POUGHKEEPSIE, NEW YORK.

STEREOSCOPIC. PROJECTION.

Application tlled J'u1y'24, 1992. 'BerlaldzNm 577,188.

To all whom t may concern:

Be it known that we, GEORGE LANE and J oiiN E. PATTERSON, citizens ofthe United States, and residents of Pou hkeepsie, in the county ofDutchess and tate of New York, have invented certain newand usefulImprovements in Stereoscopic Procctions, of which the'following is aspeci cation.

Our present invention relates to the projection of moving pictures inorder to produce an apparent third dimension to the eye, or, in otherwords, a stereoscopic eiieet.

The rincipal object of our invention is the uti ization of a single filmstri upon which are printed what we term rig t and left pictures.

Another object is the isolation of right andleft pictures from the fieldof vision, as may be found desirable, with the use of color filters.-

, through its own lens. A suitable colorfilter intercepts vthe lightfrom each picture, the

said vpictures being superimposed upon the Same screen area.

Our invention further consists in the novel arrangement, constructionand combination of parts' more fully hereinafter described.

We have illustrated one embodiment of our invention in the accompanyingdrawings, which is merely in the manner of explainin more fully' theprinciple upon which t is invention 1s based and is not t be taken in alimiting sense.

In these diagrammatic drawin Fic' one ibrm of device.

Fig. 2 -is' a view of a filter shutter.

Fig. 3 is a view of the filter shutter I nechanism.

Fig. 4 is a view of a piece of film.

1 is a diagrammatic side e evation of c Figs. '5, 6, 7, and 8 showvarious arrangements of lenses.

Referring now more-particularly to these drawings, we have illustrated afilm stri at 1 having thereon alternately arrangeld right and left handpictures, bein desi nated as R and L respectively. T e ordinarymechanism for feeding the pictures one at a time is provided. A filmgate 2 is rovided 1n the aperture plate 3 of an area su cient to allowtwo adjacentpictures to be projected therethrough. A division late 4 atsubstantially 90 to the plane o the aperture plate 3 is provided toprevent interference of the l1 ht from each picture before reachin theens. Lenses 5 ando" are provided, t rough which the up r andy oppositecolor values, such as red and green.

These filters are arranged at top and bottom of the shutter in a reversemanner, so that as the light is projected through the lenses 5' and 5bthe red filter will be vuppermost in one-half the revolution of theShutter, the green filter occupying this position during the other halfof theshutter revolution. The intermediate opaque portions of theshutter 6 intermittently cut ofi both pictures from the Screen, as inthe usual construction. The operation of the device is as follows: Thefilm strip is advanced one picture at a time as in the usual manner ofstandard machines. As adjacent right and left pictures are Ipresented tothe light through the film gate, the red portion of the color filterbeing uppermost, icture A will be shown through the 'green ter whileicture B will pass through the rei alter, tom pictures beingsuperimposed upon the Same screen area. Upon farther rotation of theshutter both pictures will be cut oil from view, during which time thepicture B will advance to the former position of picture A, and newicture C will take the lace of picture B. us pictures B and will berojected simultaneousl At this point t e color filter in rota-ting hasreversed its position, namely, the filter 9 or the color is nowuppermost, thus causing the picture C y connected to the eeding mechf tobeshown through the` green filter, the picture B still. being projectedthrough the red filter, as before. Upon a repetition of this cycle thepicture C will move into Bs position, and ast-he filter reverses itselfupon rotation will still be. projected through the green portion, as wasthe case when it occupied the upper position. In this manner the rightand left pictures will be projected through their respective colorfilters only. In this manner both eyes of the observer see at theSametime their respective right and left handviews ofv substantially ithe same picture, and there is no strain upon either eye. Inasmuch asthe superimposed pictures are robbed of'green and red rays as theyValternately ass through the red and green filters, and tllie pictures Aand B are substantially a'stereoscopic pair, av pleasing stereoscopiceffectis produced when viewed through similar color filters.

,It may be found desirable to arrange various instrumentalities by whichright and c lefty hand pictures may be projected through theirrespective lenses. In the standard film the pictures are of Va distance'between centersconsiderably less than the diameter of the ordinary lensused inthe projection l eye piece. For this reason we prefer to mounttwo lenses 5a and 5l in vertical relation, each being provided with acut away portion 10, in order to allow their centers to coincide withthe centers of the pictures before the film gate.

Another method of accomplishing this re1- sult is the provision ofsuitable prisms 11Y on the screen side of the film gate to deflect thelight rays. projected therethrough into theflenses 5*?l and 5P.. In thismanner the lenses, no matter what their size, may be separated withouthaving their sides cut away asA previously.

f tubev 12 in the path of each, picture, being spectacleshaving a redand green filter or' substantially these colors. Whenthe pictures areviewed through such `a filter, then.

picture projected through the red filter will e seen by theeye of theobserver which g is covered by the red glass or filter, the

p icture being invisible to the other eye and vice versa.

Obviously vtheft-shutter and revolva'ble` color lter need not be onemember and inv l,some cases it zwill be found desirable to have theseparts as separate elements.

i rotation. Another method is the'provision of a lens A verysatisfactory combination shutter and color filter has been found toconsist of a disc of twice the size of the standard three bladeshutter,y and revolving -at one half the speed,'having six' aperturestherein separated by opaque portions. In each of these apertures isplaced a redand a green filter at unequal radial distances from thecenter, three adjacent filter arrangement being similar, those'opposite' being the reverse. In this construction the opaque portions ofthe shutter, six in number form flicker and ,cover blades, two of theformer being adjacent one o f the latter. Theseblades 'operate in theusual manner of shutter blades. c

It will be found desirable at times to change the step ofrthe colorfilters. in relation to the projected pictures, that is to reverse thecolor while running in order to ves adjust its relationto an improperlytimed film. Sucha device may consist of acollar 16 secured to theshutter shaft 7 which presses a spring 17 Aagainst a longitudinallymovable clutch member 18V splinedto the shaft 7 and provided with aperipheral recess 19. Lugs 2O projecting from diametrically loppositepoints of one face of the clutch 18,are adapted to, seat in similar re-Hcesses 21 in the hub of the shutter disc carrying acolor filter. Theshutter is looseon shaft 7. A bell crank 22 pivoted to the machine as at23 and having an arm v24: engaging the recess 19 in the clutch isprovided to reciprocate this member -upon the shaft 7. If whileoperating the projecting apparatus it is discovered Ythat the fcolorsshow reversed in relation to the ictures, a sharp quick tap on the crank22 t rows the clutch momentarily out of engagement with the shutterwhich immediately Thev part 22 being released, the springy at oncepushes th@ clutch back into engagement with the shutter hub at the firstopportunity, which is 180 from its firstposition. This action reversesthe colors with relation to the pictures. It is .therefore possible topro erly frame and color thev lctures while eing projected, the former yuse of the usual framing device the' latter by such a combination ofparts above described. f

We claim:

lags ,fin its 1. Aymethod of producing a stereoscopic effect in movingpictures whlch includes the step of projecting through color screensvsuccessively photographed, horizontallyy differentiated, verticallyadjacent stereoscopic pictures vof black and white color values, from afilm simultaneously `on the same screen area, and viewing said picturesthrough color screens. f

2. A method of producin stereosco ic effects in moving Vpictures w ichinclu'es the step of projecting two successively through two separatefilm gates at di'erent times through color filters, and viewing theprojected ima e through color filters.

4. A metho of producing a stereosco ic eect in moving pictures, whichinclu es the ste of projecting horizontally differentiatephotographically sequential vertically adjacent stereoscoplc picturesfrom a.

strip ters and tures.

simultaneously through color lilviewing through color filters. testimonywhereof, we aix our signa- GEORGE LANE. JOHN E. PATTERSON.

